Planar lighting device

Abstract

A lighting device includes a circuit substrate; a plurality of light sources disposed on the circuit substrate; a reflection layer disposed on the circuit substrate, the reflection layer comprising a plurality of openings where respective light sources are located; a plurality of absorbers disposed at an edge of the reflection layer and at an angle with respect to the reflection layer. Further, a first area at a corner of the reflection layer absorb more light emitted from the light sources than second areas neighboring the first area; and an optical sheet disposed on the light sources.

What is claimed is: 
     
       1. A lighting device comprising:
 a circuit substrate; 
 a plurality of light sources disposed on the circuit substrate; 
 a reflection layer disposed on the circuit substrate and configured to reflect light emitted by the plurality of sources, wherein a first light source is disposed at a first corner portion of the reflection layer, and a second light source is disposed at a second corner portion of the reflection layer; 
 a first absorber disposed at the first corner portion of the reflection layer and at an area neighboring the first light source; 
 a second absorber disposed at the second corner portion of the reflection layer and at an area neighboring the second light source; and 
 an optical sheet disposed on the plurality of light sources, 
 wherein the first absorber absorbs more light emitted from the first light source than other areas neighboring the first absorber, and 
 wherein the second absorber absorbs more light emitted from the second light source than other areas neighboring the second absorber. 
 
     
     
       2. The lighting device of  claim 1 , wherein the other areas neighboring the first light source are without the first absorber, and
 wherein the other areas neighboring the second light source are without the second absorber. 
 
     
     
       3. The lighting device of  claim 1 , further comprising:
 reflection portions of the reflection layer disposed between the first absorber and the second absorber. 
 
     
     
       4. The lighting device of  claim 1 , further comprising:
 a spacer disposed between the reflection layer and the optical sheet, 
 wherein the spacer includes at least one material selected from polycarbonate (PC), polymethyl methacrylate (PMMA), glass, a resin, phenyl propanol amine (PPA) or aluminum (Al), and thus exhibits light transmission, refraction or reflection. 
 
     
     
       5. The lighting device of  claim 1 , further comprising:
 a lower cover having grooves, 
 wherein the circuit substrate is located in one of the grooves. 
 
     
     
       6. The lighting device of  claim 5 , wherein at least two circuit substrates are disposed on the lower cover and are spaced apart by a predetermined distance. 
     
     
       7. The lighting device of  claim 1 , wherein the first absorber includes a first area at a first side of the first corner portion and a second area at a second side of the first corner portion, and
 wherein the second absorber includes a first area at a first side of the second corner portion and a second area at a second side of the second corner portion. 
 
     
     
       8. The lighting device of  claim 7 , wherein the first area and the second area of the first absorber are symmetric with a central axis of the first light source, and
 wherein the first area and the second area of the second absorber are symmetric with a central axis of the second light source. 
 
     
     
       9. The lighting device of  claim 1 , wherein an absorber amount of the first absorber is different than an absorber amount of the second absorber. 
     
     
       10. The lighting device of  claim 1 , wherein the first absorber and the second absorber comprise a plurality of through holes provided in the reflection layer. 
     
     
       11. The lighting device of  claim 1 , wherein the first light source is a light source among the plurality of light sources disposed closest to the first corner portion, and
 wherein the second light source is a light source among the plurality of light sources disposed closest to the second corner portion. 
 
     
     
       12. The lighting device of  claim 1 , wherein the reflection layer comprises a first part and a second part inclined from the first part. 
     
     
       13. The lighting device of  claim 12 , wherein the first absorber and the second absorber are disposed on the second part. 
     
     
       14. The lighting device of  claim 1 , wherein the reflection layer comprises a plurality of openings where respective light sources are located. 
     
     
       15. A display device comprising:
 a lower cover; 
 a lighting device disposed on the lower cover; and 
 a display panel disposed on the lighting device, 
 wherein the lighting device comprises: 
 a circuit substrate; 
 a plurality of light sources disposed on the circuit substrate; 
 a reflection layer disposed on the circuit substrate and configured to reflect light emitted by the plurality of sources, wherein a first light source is disposed at a first corner portion of the reflection layer, and a second light source is disposed at a second corner portion of the reflection layer; 
 a first absorber disposed at the first corner portion of the reflection layer and at an area neighboring the first light source; 
 a second absorber disposed at the second corner portion of the reflection layer and at an area neighboring the second light source; and 
 an optical sheet disposed on the plurality of light sources, 
 wherein the first absorber absorbs more light emitted from the first light source than other areas neighboring the first absorber, and 
 wherein the second absorber absorbs more light emitted from the second light source than other areas neighboring the second absorber. 
 
     
     
       16. The display device of  claim 15 , wherein the other areas neighboring the first light source are without the first absorber, and
 wherein the other areas neighboring the second light source are without the second absorber. 
 
     
     
       17. The display device of  claim 15 , wherein the lighting device further comprises:
 reflection portions of the reflection layer disposed between the first absorber and the second absorber. 
 
     
     
       18. The display device of  claim 15 , wherein the lighting device further comprises:
 a spacer disposed between the reflection layer and the optical sheet, and 
 wherein the spacer includes at least one material selected from polycarbonate (PC), polymethyl methacrylate (PMMA), glass, a resin, phenyl propanol amine (PPA) or aluminum (Al), and thus exhibits light transmission, refraction or reflection. 
 
     
     
       19. The display device of  claim 15 , wherein the lighting device further comprises:
 a lower cover having grooves, and 
 wherein the circuit substrate is located in one of the grooves.